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vlt.neuro.vision.simp_sat_cgain

  vlt.neuro.vision.simp_sat_cgain - Simple saturating contrast gain

   G = vlt.neuro.vision.simp_sat_cgain(C, Cs)

   Returns a simple contrast gain.  If contrast C is
   less than Cs, then G = 1.  Otherwise, gain is
   1-(C-Cs).  The gain falls off monotonically with
   slope 1 after the point Cs.